SS Fuso Maru was a Japanese ocean liner that was torpedoed by the United States Navy submarine USS Steelhead (SS-280) in the South China Sea 280 nautical miles (520 km) northwest of , Luzon, the Philippines, at (18°51′N 122°55′E / 18.850°N 122.917°E), while she was travelling in Convoy MI-11 from Moji, Japan, to Miri, Borneo.